Johannes Benkhoff, European Space Research and Technology Centre, Noordwijk Zh, Netherlands, Go Murakami, JAXA Japan Aerospace Exploration Agency, Sagamihara, Japan, Patrick Martin, European Space Astronomy Centre (ESAC) European Space Agency (ESA), Villafranca del Castillo, Villanueva de la Canada, Spain and Joe Zender, ESAC, ESTEC, Noordwijk, Netherlands